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采用化学镀方法在45钢表面制备平均晶粒尺寸约为68nm的纳米晶铜涂层。显微分析表明,纳米晶铜存在明显的(111)晶面织构,其表面由大量微/纳米级团簇组成。采用UMT-Ⅱ型摩擦磨损试验机进行销–盘旋转实验,对比研究纳米晶铜与粗晶铜的摩擦学性能。结果表明,纳米晶铜的摩擦系数和跑合时间均随滑动速度的增大而降低。当滑动速度为0.25m/s时,其在机油和石蜡润滑条件下的摩擦系数分别为0.02和0.03。相同润滑条件下,纳米晶铜的摩擦学性能优于粗晶铜,这与其较好的表面疏液性能和较高的硬度值有关。
Nanocrystalline copper coatings with an average grain size of about 68 nm were prepared on the surface of 45 steel by electroless plating. Microscopic analysis shows that there is a clear texture of (111) crystal plane in nanocrystalline copper and its surface is composed of a large number of micro / nano-scale clusters. The UMT-Ⅱ type friction and wear testing machine was used to conduct the pin-plate rotation experiment, and the tribological properties of nanocrystalline copper and coarse-grained copper were compared. The results show that the friction coefficient and the running time of nanocrystalline copper decrease with the increase of sliding velocity. When the sliding speed is 0.25m / s, its coefficient of friction under oil and paraffin lubrication is 0.02 and 0.03, respectively. Under the same lubrication conditions, the tribological behavior of nanocrystalline copper is better than that of coarse-grained copper, which is related to its better surface lyophobic property and higher hardness value.